Shade roller check



July 5, 1938. J. M. WILSON SHADE ROLLER CHECK Filed nec. 15, 1922'sPatented July 5, 1938 PATENT OFFICE SHADE ROLLER CHECK James M. Wilson,Newark, N. J., assignor, by mesne assignments, to Shade Check, Inc.,Newark, N. J., a corporation of New Jersey Application December 15,1936, Serial No. 115,897

3 Claims.

This invention relates particularly to spring actuated window shaderollers, and more especially to a check for preventing rotation of theroller under the influence of the spring at a speed in excess of apredetermined limit, for example when a shade escapes from the hand ofthe person raising or lowering the shade. However, the invention isequally susceptible to other types of spring operated rollers.

One object of the invention is to provide a novel and improved check ofthe nature described which shall include a part carried by the roller toengage a stationary member, for example a shade-bracket, said partnormally permitting free rotation of the roller in raising or loweringthe shade, in combination with means carried by the roller and actuatedby centrifugal force caused by rotation of the roller at an excessivespeed to positively engage said part so as to stop rotation oi theroller.

v Another object is to provide such a check which can be utilized inconnection with many different types of spring operated rollers and manydifferent types of stationary supports or roller brackets, and which canbe easily and quickly applied to the end of a roller opposite the usualcontrolling pawls and ratchets so that the unit can be supplied tousersof shade rollers for application to rollers already ,in use.

Other objects are to provide a spring roller check of the characterdescribed winch shall include a pawl and ratchet mechanism carried bythe roller and including cooperating parts, one of which is adapted toengage a stationary support, for example a shade bracket, while theother is movably mounted on the roller and subject to actuation bycentrifugal force, said pawl and ratchet being normally disengaged fromeach other to permit free rotation of the roller in both directions atnormal speed and being forced into interlocking engagement upon rotationof the roller at excessive speed under iniluence` of the roller springsoas to stop rotation of the roller;

and to obtain otherA advantages and results as will be brought out bythe following description.

Referring to the accompanying drawing in which corresponding and likeparts are designated throughout the several views by the same referencecharacters,

Figure 1 is a1 top plan View of a shade roller installed in brackets andhaving a check embodying my invention applied thereto.

Figure 2 is an end View of the roller and shade bracket on thel line 2-2of Figure 1.

(c1. 15s-3c) Figure 3 is an enlarged fragmentary sectional View on theline 3-3 of Figure 1.

Figure 4 is a sectional View on the line 4-4 of Figure 1.

Figure 5 is a sectional View on the line 5--5 of Figure 2 showing thepawl and ratchet tooth in normal disengaged relation.

Figure 6 is a horizontal sectional view on the line 'I-l of Figure 1.

Figure 7 is a view similar to Figure 6 showing 10 the pawl in engagementwith the ratchet tooth to stop rotation of the roller, and

Figure 8 is a fragmentary plan View of one end of a shade roller showinga modification of the invention.

Specically describing the invention, the reference character Adesignates a spring operated shade roller of known construction havingthe usual controlling pawl and ratchet mechanism B at one end, a fixedshaft C and a trunnion D at its opposite ends mounted in stationarysupports or brackets E. Within the roller is the usual spring fornormally rotating the roller in one direction, for example to wind theshade thereon, the spring being tensioned or wound by rotation of theroller in the other direction as in lowering the shade.

At the end of the roller opposite the controlling pawls B is the checkembodying my invention. This check is shown as including a casing Gincluding a cup-shaped section I and a cover plate 2. Preferably,although not necessarily, the edge of the section I has a plurality oflugs 3 fitted in notches 4 in the cover plate for securing the coverplate on the cup-shaped section I.

The casing is secured to the end of the roller by the rotatable trunnionD which as shown preferably includes a pointed shank 5 to be driven intothe roller, and a bearing portion forming a shoulder l between itselfand the shank 5. At

the end of the bearing portion 6 opposite the shoulder 'I is a collar 8,and outwardly of the collar is a trunnion portion 9 to t the opening inthe corresponding bracket E. The shank of the trunnion D passes throughan opening in the ing through an opening |50 on the cover plate Y andbeing riveted to the shank I6 of a stop member which has a laterallyprojecting end II to engage the shade bracket E. The ratchet sleeve I4and stop member II are normally freely rotatable on the trunnion D,although a complete revolution of the sleeve and stop member isprevented by engagement of the stop member with the top or bottom of theshade bracket, as shown, for example in Figure 2.

Cooperating with the ratchet sleeve I4 is a pawl I8 pivotally mountedintermediate its ends ona pin I9 secured in the casing section I. Oneend of the pawl I8 is counterweighted at 20, and a leaf spring 2l isinterposed between the pawl and the casing section I so that the pawl isnormally held out of engagement with the ratchet tooth I during rotationof the roller at normal speed as when raising and lowering the windowshade, for example as shown in Figure 5, while when the roller isrotated at a greater than normalV speed or in excess of a predeterminedspeed under influence of the roller spring, the centrifugal force set upby rotation of the roller will swing the pawl I8 into engagement withthe vratchet tooth I5, as shown in Figure 7.

Whenrthe pawl and ratchet tooth arerdisengaged as shown in Figure 5, theroller may freely rotate in either direction at normal speed.However,`the ratchet tooth is so related tothe direction of rotation ofthe roller that when the roller is rotated at a greater than normalspeed or in excess of a predetermined speed under influence of thespring in one direction, as upon escape of the shade from the hand ofthe person adjusting it, the centrifugal force set up by rotation of theroller will swing the pawl I8 into engagement with the tooth I5, asshown in Figure 7, which will in turn cause rotation of the sleeve I 4and stop member so that the laterally extending end vI'I of the stopmember will engage the shade Vbracket 8 and stop further rotation of theVroller in the same direction. Obviously the roller may be rotated inthe other direction, vas in unwinding the shade, at any desired speedwithout interference by the pawl and ratchet check.

Ifodesired, the stop member I6, Il may befastened against movement tothe bracket E or other vstationary member, such as the window frame.

In Figure 8 is shown a modification wherein the shade roller is mountedin another form of bracket 22 which has a notch 23 at one edge in Vwhichthe stop member I1 is inserted. The

the roller or the brackets.

While the forms of the invention herein described are the now preferredforms, it should be understood that they are primarily for the purposeof illustratingthe principles of the invention and that manymodifications and changes may be made in the details of'structurewithout departing from the spirit or scope of the invention.

Having thus described my invention, Ywhat I claim is:

1. The combination with a spring actuated roller,v of meansforcheckingthe roller upon rotation thereof under influence of its springat a speed in excess of a predetermined limit, said means includingrastationary member adjacent but spaced Yand separate from one end of theroller, a casing including a cup-shaped section having a central openingin its bottom, a trunnion pin tted coaxially in said end of the rollerand having a shoulder engaging the bottom of the casing to clamp thecasing between itself and the end of the roller, a ratchet sleeve havingT a tooth mounted on said pin outwardly of said shoulder for relativerotation coaxially therewith and having a lateral projection adapted inone position to engage said stationary member, and a pawl pivoted onsaid casing to cooperate with said ratchet tooth and normally disengagedtherefrom to permit rotation of said roller under influence of theroller lspring at speeds below said limit, said pawl being actuated bycentrifugal force into engagement with said tooth and said ratchetsleeve being thereby. rotated to cause engagement of said lateralprojection with said stationary member upon rotation of said roller atexcessive speed to stop rotation of the ro-ller.

2. The combination with a spring actuated roller, of means for checkingthe roller upon rotation thereof under influence of its spring at aspeed in excess of a predetermined limit, said means includingastationary member adjacent but spaced from one end ofthe roller, acasing secured coaxially on said end of the roller, a pin kthrough andcoaxial with said casing and freely rotatable relative to saidstationary member, a ratchet sleeve having a tooth mounted on said pinwithin the" casing for relative rotation coaxially therewith and havinga portion projecting lfrom said casing and adapted inone position toengage said stationary member, and a pawl pivoted in said casing tocooperate with said ratchet tooth and normally disengaged therefrom topermit rotation of said roller under influence of the roller spring atspeeds below said limit, said pawl being-:actuated 'by centrifugal forceinto engagement with said tooth and said ratchet sleeve being therebyrotated to cause engagement of said projecting portion with saidstationary member upon rotation of said roller at excessive speed tolstop rotation of the roller.

3. The combination with a spring actuated roller, of means for checkingthe roller upon rotation thereof under-influence of its spring ata speedin excess of a predetermined limit, said means including a vstationarymember adjacent but spaced from one end of the roller, a pin on said endof said roller coaxial therewith and freely rotatable with respect tosaid stationary member, a part on and rotatable relatively to said endof the roller and adapted inone position to engage said stationarymembenand a second part pivotally mounted on said roller to cooperatewith said rst part and normally ldisengaged therefrom to permit freerotation of said roller under influence of the roller spring atv speedsbelow said limit, said second'part being actuated Aby centrifugal forceinto engagement with said first part and said'iirst part being therebyactuated into engagement with said stationary mem-

